Evaluación de alternativas para el manejo de mosca minadora de hojas (Hydrellia wirthi L.) En arroz bajo riego en la zona de Babahoyo

Rice is today one of the products of economic importance in the country, because it is the main source of food for the national population. This crop is attacked by many insects, some of which are considered pests and can cause great damage depending on the population levels and the severity of the attack. Among them is the miner fly or Hydrelia (Hydrellia wirthi), currently this species is causing serious economic problems in rice plantations in the province of Guayas, Manabí and Los Ríos. Due to excessive chemical control of this pest, deficiencies have been observed in some products that were previously very lethal. Contrary to what was expected given the diversity of paradigms and approaches, chemical control remains. The amount of active ingredient applied per unit of cultivated area continues to grow, although pesticides applied at very low doses have been developed in recent decades. The stated objective was to evaluate alternatives for the management of the leaf miner fly in irrigated rice in Babahoyo. The investigation was carried out on the land of the "La Ventura" Farm, a rice farm located in the Babahoyo canton. In the field work, an experimental design of "randomized complete blocks (BCA)" with factorial arrangement was used. The analysis of variance determined the significance between the treatments evaluated, the comparison of the means in the treatments was made with the Scheffé test at 1%. The response of the applied treatments on insect mortality was analyzed by the Probitt Method. The treatments were: Chlorpyrifos, Fipronil, Diazinon, Imidacloprid, Azadirachtin, Capsaicin + Glucosinates, cinnamic aldehyde and a control without application The management of the trial was based on recommendations given by INIAP, being the variables evaluated: population of larvae of Hydrellia wirthi, mortality corrected, Probitt analysis, percentage of mortality, percentage of damage, number of tillers/m², number of panicles/m², number of grains per spike, length of panicles, weight of 1000 seeds, yield per hectare and economic analysis. The results indicate that the larval populations were higher before the applications of the insecticides, presenting these ranges of 2-5 larvae per plant. The use of the damage threshold helps in the optimization of insecticide application. The pesticides-maintained control ranges between 75 and 78, except for Diazinon and Capsaicin+Glucosinates, which showed ranges greater than 94%. The products Diazinon 1.0 l/ha and Capsaicin+Glucosinates 0.5 l/ha reduce the populations of Hydrellia wirthi, with corrected control percentages of 94.44% and 94.64% in the field. All treatments achieved a decrease in the population of the treated insect, however, some of them did not achieve the desired minimum range of control.

• Main Author: Noboa Salazar, José Luis (author)
• Format: masterThesis
• Published: 2023
• Subjects: Hydrellia; Arroz; Diazinon; Capsaicina
• Online Access: http://dspace.utb.edu.ec/handle/49000/15403